Abstract
In view of recent inconsistencies in the relation between the bond lengths and rotational constants in the isotopic acetylenes, some vibration-rotation bands of acetylene have been re-measured, and the results have been analyzed together with earlier work on this molecule. The
α
values for each of the molecular vibrations have been re-determined, taking into account possible vibrational perturbations and also anomalous changes in the centrifugal stretching constant
D
of the different vibrational levels. The new values of
α
,
1
,
α
2
,
α
3
and (
α
4
+
α
5
) for acetylene are in line with the corresponding values for the deuterated derivatives, and using
B
o
= 1·1766 lead to
B
e
+ 1·1817. If bond lengths
r
e
(CH) = 1·058
5
,
r
e
(CC) = l·204
7
Å are assumed, the results for all three isotopic molecules are mutually consistent. Values have also been obtained for the
l
-doubling coefficients,
q
4
and
q
5
.
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